Progress against the field
From Rotterdam 2025 to Utrecht 2025, the field gained 12:54 on Jolanda Janssen.
The clock says 11:01 slower, but the races themselves got 1:53 quicker for everyone.
How this is worked out ⓘ
A finish time moves for two reasons: the athlete, and the race — its course, its floor, its day. For each pair of races in a row in one category, we take everyone who raced both and use the middle of how much they moved (the median) as "the race". Whatever is left is the athlete. Doubles are compared only when the same two people raced both, and told as the pair's; relays are left out. A pair with fewer than 15 athletes in common is not shown. The summary above covers Individual Open · Women, the one raced most; every comparison is in the list below.
Every race
4 races · 4 events
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Rotterdam15 Apr 2026Doubles Open · Mixed1:33:51 PB433/544Beat 20%
↑ 84 days after Amsterdam 2026, with Michael Colijn 5:14 better than the field Why ↓Close ↑
5:14 better than the field: 6:04 faster on the clock, against 0:50 faster for everyone.
The fieldCompare these two →0:50 faster This pair6:04 faster -
Amsterdam21 Jan 2026Doubles Open · Mixed1:39:551142/1206Beat 5%
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Utrecht28 Nov 2025Individual Open · Women2:06:28233/254Beat 8%
↑ 274 days after Rotterdam 2025 12:54 worse than the field Why ↓Close ↑
12:54 behind the field: 11:01 slower on the clock, against 1:53 faster for everyone.
The fieldCompare these two →1:53 faster This athlete11:01 slower -
Rotterdam27 Feb 2025Individual Open · Women1:55:27 PB441/506Beat 13%